Improved global maps and 54-year history of wind-work on ocean inertial motions

Details Improved global maps and 54-year history of wind-work on ocean inertial motions Improved global maps and 54-year history of wind-work on ocean inertial motions

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30h...6a&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 8, pp. 6-1, CiteID 1424, DOI 10.1029/2002GL016614

Physics

30

Oceanography: Physical: Internal And Inertial Waves, Oceanography: Physical: Air/Sea Interactions (0312), Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes, Oceanography: General: Climate And Interannual Variability (3309)

Scientific paper

The global distribution and 54-year time dependence of the energy-flux from the wind to near-inertial motions is computed by driving a slab mixed-layer model with NCEP/NCAR Reanalysis winds, improving upon previous estimates [Alford, 2001; Watanabe and Hibiya, 2002]. The slab model is solved spectrally with frequency-dependent damping. The resulting solutions are more physically sensible than the previous, and more skillful at high latitudes, where the inertial frequency approaches the 4×-daily sampling of the Reanalysis winds. This enables Alford's calculation, whose domain was limited to +/-50°, to be extended to the poles. The high-latitude reliability is demonstrated by direct comparison with a high-resolution regional model (REMO) in the NE Atlantic. The total power input, 0.47 TW, has increased by 25% since 1948, paralleling observed increases in extratropical cyclone frequency and intensity. If believable, the trend may have important consequences for modulation of the meridional overturning circulation.

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